21543341403 has 16 divisors (see below), whose sum is σ = 29299731200. Its totient is φ = 14076745056.

The previous prime is 21543341363. The next prime is 21543341419. The reversal of 21543341403 is 30414334512.

It is not a de Polignac number, because 21543341403 - 2⁹ = 21543340891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21543341423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229300 + ... + 309297.

It is an arithmetic number, because the mean of its divisors is an integer number (1831233200).

Almost surely, 2^21543341403 is an apocalyptic number.

21543341403 is a deficient number, since it is larger than the sum of its proper divisors (7756389797).

21543341403 is a wasteful number, since it uses less digits than its factorization.

21543341403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538866.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 21543341403 its reverse (30414334512), we get a palindrome (51957675915).

The spelling of 21543341403 in words is "twenty-one billion, five hundred forty-three million, three hundred forty-one thousand, four hundred three".